nix on FreeBSD

λ nix repl
Welcome to Nix version 2.3.1. Type :? for help.

nix-repl> :l <nixpkgs>
Added 11549 variables.

nix-repl> :b curl
[1/0/14 built, 8 copied (32.8/32.8 MiB), 32.5 MiB DL] building c-ares-1.15.0 (configurePhase): chec
builder for '/nix/store/2wvlili3ci9sk97is0m4xzin5r36759i-libkrb5-1.18.drv' failed with exit code 2; last 10 log lines:
  building shared verto library (0.0)
  set -x; objlist=`set -x && perl -p -e 'BEGIN { $SIG{__WARN__} = sub {die @_} }; $e=$ARGV; $e =~ s/OBJS\...$//; s/^/ /; s/ $//; s/ / $e/g;' OBJS.SH` && ld -Bshar
eable -o libverto.so.0 $objlist --enable-new-dtags -rpath /nix/store/ddzvy13axvmv1hbfyygqpp0fdx7d98v3-libkrb5-1.18/lib -L../../lib  -lm
  + set -x
  + perl -p -e 'BEGIN { $SIG{__WARN__} = sub {die @_} }; $e=$ARGV; $e =~ s/OBJS\...$//; s/^/ /; s/ $//; s/ / $e/g;' OBJS.SH
  + objlist=' verto.so module.so verto-k5ev.so'
  + ld -Bshareable -o libverto.so.0 verto.so module.so verto-k5ev.so --enable-new-dtags -rpath /nix/store/ddzvy13axvmv1hbfyygqpp0fdx7d98v3-libkrb5-1.18/lib -L../.
./lib -lm
  ld: error: unable to find library -lm
  make[1]: *** [Makefile:728: libverto.so.0] Error 1
  make[1]: Leaving directory '/tmp/nix-build-libkrb5-1.18.drv-0/krb5-1.18/src/util/verto'
  make: *** [Makefile:888: all-recurse] Error 1
cannot build derivation '/nix/store/0sanxss5q7xnvad58qj8lycc873apmb3-curl-7.68.0.drv': 1 dependencies couldn't be built
[10 built (1 failed), 8 copied (32.8 MiB), 32.5 MiB DL]
error: build of '/nix/store/0sanxss5q7xnvad58qj8lycc873apmb3-curl-7.68.0.drv' failed

nix-repl> :b (curl.override { gssSupport = false; })
[3 built, 0.0 MiB DL]

this derivation produced the following outputs:
  bin -> /nix/store/i3s88wzsf0x1xprip6y44qq8j99czsyg-curl-7.68.0-bin
  dev -> /nix/store/xqxj8rpam0vwffm1g7wqlbcwfck3pnin-curl-7.68.0-dev
  devdoc -> /nix/store/x2qy2a08d9hjcdpwjsjrn3csqq8cpsk7-curl-7.68.0-devdoc
  man -> /nix/store/l37clg8cnhfxqhngfr8dk1f4mbmkkihf-curl-7.68.0-man
  out -> /nix/store/y3hvihmgv5sjq1h7j9lfwdd7yyzavays-curl-7.68.0

nix-repl> :b (curl.override { gssSupport = false; })

λ ldd  /nix/store/i3s88wzsf0x1xprip6y44qq8j99czsyg-curl-7.68.0-bin/bin/curl
/nix/store/i3s88wzsf0x1xprip6y44qq8j99czsyg-curl-7.68.0-bin/bin/curl:
        libcurl.so.4 => /nix/store/y3hvihmgv5sjq1h7j9lfwdd7yyzavays-curl-7.68.0/lib/libcurl.so.4 (0x800268000)
        libnghttp2.so.14 => /nix/store/j06hnkqx8xa7fkxiy491ikwxlahjki2s-nghttp2-1.40.0-lib/lib/libnghttp2.so.14 (0x8002e4000)
        libssh2.so.1 => /nix/store/abi8v4mnvmpg4i04cc4z60zbmrj7wdkw-libssh2-1.9.0/lib/libssh2.so.1 (0x800311000)
        libssl.so.1.1 => /nix/store/nh47xiqisj8j0bkmddqffkyvn7m1xs2b-openssl-1.1.1d/lib/libssl.so.1.1 (0x800350000)
        libcrypto.so.1.1 => /nix/store/nh47xiqisj8j0bkmddqffkyvn7m1xs2b-openssl-1.1.1d/lib/libcrypto.so.1.1 (0x8003ea000)
        libz.so.1 => /nix/store/gmigb4l86bc9mh0qqsb8pmbgw7iichvf-zlib-1.2.11/lib/libz.so.1 (0x8006d2000)
        libthr.so.3 => /lib/libthr.so.3 (0x8006ed000)
        libc.so.7 => /lib/libc.so.7 (0x80071a000)